<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    #box {
      width: 300px;
      height: 300px;
      background-color: peru;
    }
  </style>
</head>

<body>
  <div id="box">
    <p> 节流 冷却CD 在一段时间的开始 执行</p>
  </div>
</body>
<script>
  const oBox = document.getElementById('box')

  //事件函数
  function center() {
    console.log(11);
  }

  oBox.onmousemove = throttle(center, 1000);

  //节流函数
  function throttle(fn, time) {
    let lastTime = 0
    return function (e) {
      let nowTime = Date.now()
      //写一个看门狗
      //CD 时间
      if (nowTime - lastTime < time) {
        return
      }
      lastTime = nowTime
      fn()

    }

  }




</script>

</html>